A pocket watch is a timekeeping device designed to be carried in a pocket, typically attached to a chain. Unlike wristwatches, pocket watches are larger and often feature intricate designs. They were popular from the 16th century until the early 20th century, serving as a status symbol and a practical tool for keeping time. Most pocket watches have a round case and a hinged cover that protects the glass face. They can be mechanical, requiring winding, or quartz, powered by a battery. Famous brands like Patek Philippe and Waltham are known for their craftsmanship and historical significance in the world of horology.